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(No Model.) 2 Sheets- Sheetv 2.l

U. LAvoIE.- STAMP MILL.

No. 560,805. Patented May 26, 1896.

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WITNESSES.- INVENTUR au@ (/ra/n Lava/e ELI/:1115; "Q

ATTORNEY AN DREW E GRAHAM, FHUTO-UTHQWASHVNGTUN. 0,0

UNITED STATES" PATENT OFFICE.

URBAIN LAVOIE, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO AUGUSTEDENTRESSANGLE, OF SAME PLACE.

STAM P-NlILL.

SPECIFICATION forming part of Letters Patent No. 560,805, dated May 26,1896. Application filed March 1l, 1895l .Serial No. 541,367. (No model.)

To all whom it nea/y concern.'

Be it known that l, URBAIN LAvoIE, a citizen of the United States ofAmerica, residing` at Denver, in the county of Arapahoe and State ofColorado, have invented certain new and useful Improvements inStamp-Mills; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use thel same, referencebeing had to the accompanying drawings, and to the figures of referencemarked thereon, which form a part of this specification.

My invention relates to improvements in `stamp-mills; and it consists ofthe features hereinafter described and claimed, all of which will befully understood by reference to the accompanying drawings, in which isillustrated an embodiment thereof.

In the drawings, Figure 1 is a side elevation of the machine. Fig. 2 isa vertical section taken on the line om, Fig. 3. Fig. 3 is a top or planview of the machine. Fig. Il is a section taken on the line ,e e', Fig.2. Fig. 5 is a section taken on the line y y, Fig. 1, lookingV towardthe left. Fig. 6 is a top view of one of the chain-whcels,showingseveral links in position. Fig. 7 is a section taken on the line p p,Fig. 2, looking toward the right.

Similar reference-characters indicate corresponding parts in the views.

Let the numeral 5 designate a suitable framework, upon which are mountedthe stamps 6, adapted to engage the dies 7 of the mortar-box 8. The stem9 of each stamp is provided with an inclined cam 10, adapted to engagean oppositely-disposed inclined cam 12, supported on the framework. Madefast to each stamp-stem is a collar 13, fashioned to receive a chain 14,engaging a pulley 15, made fast on the power-shaft 16, journaled in theframework. The periphery` of each pulley 15 is grooved to receive thelinks of the chain, and the shape of the groove is such that the chaincannot slip upon the pulley. As shown in the drawings, (see Fig. 6,) thegroove in the face of the pulley is made up of a series of recesses 15ULand 15C, alternately arranged. VThe recesses 15AVL are adapted to engagethe flat side of the links, while the recesses 15c oppositely-disposedinclined cams 10 and 12,

attached to the stamp-stems and the framework, respectively. During eachcomplete revolution of the shaft 16 the stamp is raised and released,and, since its rotation is continuous, the stamp makes a partialrotation while engaging the material in the mortarboX, thus greatlyincreasing the Vefficiency of the stamps action, since the material inthe mortar-box is ground between the stamp and the die.

One extremity of the shaft 1G is provided with afast pulley 17, whichmaybe connected with any suitable prime motor through the agency of abelt 18.

The pulverized ore, as it passes through the screen 7 f of themortar-box, falls upon a movable amalgamating-table 20, whichis agitatedby a shaft 2l, located beneath the table and carrying a cam engaging thebottom thereof. The shaft 21 is provided with a pulley 22, which isconnected by means of a belt 23 with 'a pulley 24 on a shaft 25,journaled in the framework. This last-named shaft is operated from theshaft 1G, which is provided with a pulley 26, connected by means of abelt 27 with a pulley 28 on the shaft 25.v The shaft 25 is provided witha pulley 29,connected with a pulley 30 by a belt 32.

The pulley 30 is fast on a shaft 31, journaled in the lower part of theframework and provided with a cam adapted to engage the bottom of amovable amalgamating-table 33. One extremity of this table rests uponthe shaft, while the other extremity is provided with a dependingprojection 33, engaging a suitable stationary socket attached to thebase of the framework. In front of the table 33, and located above thesame, is an auxiliary mortar 35, in which is located a rotatable shoe36, engaging a die 37. This shoe is provided with a hollow stem 38,whose opening coincides with an aperture in the center of the shoe. Theupper extremity of this stem IOO communicates with a trough 39, whichreceives the discharge from the table 20.

The stem 38 of the rotatable shoe is provided with a fast pulley40,Which is connected by means of a belt 41 with a pulley 4t2 on theshaft 25. A rotary movement is thus irnparted to the shoe,vvhich furthercomminutes the pulverized material passing from the table 2O to theauxiliary mortar via the trough 39 and the hollow stamp-stem.

From the foregoing description it will be understood that when the shaft16 is operated motion is communicated to all the movable parts of themachine. The material to be treated is fed to a hopper 7C, connectedwith the mortar-box 7 and communicating therewith by means of suitableapertures. After being pulverized by the stamps to a suitable degree thematerial passes in the form of pulp through the screen 7 to theamalgamating-table 20, whose function is to catch the free gold releasedfrom the ore through the process of pulverization. From the table 20 thepulp passes to the trough 30, and thence through the hollow stem 38 andthe shoe 36 to the auxiliary mortar-box 35,wl1ere it is furtherpulverized or comminuted by the action of the rotary shoe 3G. The pulpfinally passes to the amalgamating-table 33, Whose function is to catchthe free mineral which escaped the table 20.

Having thus described my inventioinwhat I claim is-` In a stamp-mill,the combination with suitable mortars, of a number of stamps havingtheir stems provided with inclined cams, the framework provided withoppositcly-disposed inclined cams adapted to engage the cams on thestamp-stems, means for imparting a ro- Y on the shafts 21 and 25,another belt connecting pulleys fast on shafts 16 and 25, respectively,a movable amalgamating-table 33, a cam-shaft 31 engaging the bottom ofthe table and carrying a pulley, a belt connecting` the pulley on shaft31 With the pulley on the shaft 25, an auxiliary mortar 85 locatedintermediate the two amalgamatingtables 20 and 33, said mortar receivingthe material from the table 20 and discharging it upon the table 33, arotatable shoe located in the auxiliary mortar and provided witha hollowstem through which the material passes to the mortar, a horizontalpulley fast on the stem of said shoe, and a belt connecting the pulleyon the stem with the pulley on the shaft 25, y

as and for the purpose set forth.

In testimony whereof I aflix mysignature in the presence of twowitnesses.

URBMN LAVOIE. Witnesses:

CHAs. E. DAWSON, A. DENTREssANcLE.

